Cut Sides and Back
Cut two sides at 3-3/4- x 25-1/2-inches.
Cut one back at 3-7/8- x 25-1/2-inches.
Make a 1/8-in. wide x 1/4-in. deep groove 1/2-inch from the edge on both sides. (See photo.)
https://www.familyhandyman.com/project/how-to-make-solar-powered-house-numbers/
